Reconstructing the cosmic equation of state from supernova distances

被引:351
作者
Saini, TD [1 ]
Raychaudhury, S
Sahni, V
Starobinsky, AA
机构
[1] Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India
[2] LD Landau Theoret Phys Inst, Moscow 117334, Russia
[3] MPI Astrophys, D-86740 Garching, Germany
关键词
D O I
10.1103/PhysRevLett.85.1162
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Observations of high-redshift supernovae indicate that the Universe is accelerating. Here we present a model-independent method for estimating the form of the potential V(phi) of the scalar field driving this acceleration, and the associated equation of state w(phi). Our method is based on a Versatile analytical form for the luminosity distance D-L, optimized to fit observed distances to distant supernovae and differentiated to yield V(phi) and w(phi). Our results favor w(phi) similar or equal to -1 at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.
引用
收藏
页码:1162 / 1165
页数:4
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